Angular motion

Question 1

Define angular motion

Answer 1

Movement around a fixed point

Question 2

When does angular motion occur?

Answer 2

When a force is applied outside of the centre of mass

Question 3

Define torque

Answer 3

The rotational consequence of a force

Question 4

What can torque also be known as ?

Answer 4

Moment

Question 5

Equation for torque

Answer 5

Moment or torque (Nm) = Force(N) X Perpendicular distance from fulcrum (m)

Newton metres NOT newtons per metre

Question 6

What is newtons first law in relation to angular motion?

Answer 6

A rotating body will continue to turn about its axis with constant angular momentum until an external rotational force (torque) is exerted on it

Question 7

What is newtons second law in relation to angular motion?

Answer 7

The rate of change of angular momentum of a body and its direction is proportional to the torque and its direction

Question 8

What is newtons third law in relation to angular motion?

Answer 8

When torque is applied by one body to another, the second body will exert an equal and opposite torque on the other body

Question 9

Define angular displacement

Answer 9

The smallest change in angle between the start and finish point of rotation

Question 10

What is 1 radian equal to in degrees?

Answer 10

57.3 degrees

Question 11

Define angular velocity

Answer 11

The rate of change of angular displacement

Question 12

Equation for angular velocity

Answer 12

Angular velocity (rad/s) = Angular displacement (rad) / time (s)

Question 13

Define angular acceleration

Answer 13

The rate of change of angular velocity

Question 14

Equation for angular acceleration

Answer 14

Angular accleration (rad/s^2) = Change in angular velocity (rad)/time (s)

Question 15

Define moment of inertia

Answer 15

Resistance of a body to angular motion

Question 16

What 2 factors affect the moment of inertia?

Answer 16

Mass of the body

Distribution of mass around the axis

Question 17

What is the effect of an increase in mass on moment of inertia?

Answer 17

Increases moment of inertia

Question 18

How does a large distribution of mass affect the moment of inertia?

Answer 18

Greater distribution of mass increases moment of inertia

Question 19

Define angular momentum

Answer 19

The quantity of rotation a body possesses

Question 20

What is the equation for angular momentum?

Answer 20

Angular momentum = moment of inertia X angular velocity

Question 21

What is the relationship between angular velocity and moment of inertia?

Answer 21

They are inversely proportional